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Re: "here strings" and tmpfiles
From: |
Chet Ramey |
Subject: |
Re: "here strings" and tmpfiles |
Date: |
Thu, 11 Apr 2019 15:25:57 -0400 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 |
On 4/11/19 12:02 AM, Jason A. Donenfeld wrote:
> Hi Chet,
Hi.
> I hope that can shed light on the motivation a bit. Pass got hit by
> this a bit ago:
> https://git.zx2c4.com/password-store/commit/?id=367efa5846492e1b0898aad8a2c26ce94163ba24
I note that the pipe-for-small-enough-heredocs works for this case.
> Anyway, the more interesting thing is discussing what a proper fix
> would be. Do you see anything conceptually wrong with the NONBLOCK
> approach I suggested? In theory, would that work?
I'd prefer the fork-a-child-and-let-it-do-the-writing approach. The
question is where to place it on a list of issues.
> Another thing I was
> curious about is - what about internally treating "x <<y" as "echo y |
> x"? Are these somehow not quite equivalent because x is in a subshell
> in one but not the other, or something like that? And if that's so,
> would my NONBLOCK suggestion incur similar issues?
They're quite semantically different -- subshells, pipes, different
expansion semantics, among others -- and result in additional, possibly
unexpected, issues.
For instance, consider what happens in your script when someone runs
it on a bash version that has been compiled for strict posix conformance,
including xpg_echo being on by default.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/
- Re: "here strings" and tmpfiles, (continued)
- Re: "here strings" and tmpfiles, Daniel Kahn Gillmor, 2019/04/11
- Re: "here strings" and tmpfiles, Chet Ramey, 2019/04/11
- Re: "here strings" and tmpfiles, Jason A. Donenfeld, 2019/04/11
- Re: "here strings" and tmpfiles, Jason A. Donenfeld, 2019/04/11
- Re: "here strings" and tmpfiles, Jason A. Donenfeld, 2019/04/11
- Re: "here strings" and tmpfiles, Chet Ramey, 2019/04/11
- Re: "here strings" and tmpfiles, Greg Wooledge, 2019/04/11
- Re: "here strings" and tmpfiles,
Chet Ramey <=
- Re: "here strings" and tmpfiles, Robert Elz, 2019/04/11
- Re: "here strings" and tmpfiles, Chet Ramey, 2019/04/11
- Re: "here strings" and tmpfiles, konsolebox, 2019/04/10
Re: "here strings" and tmpfiles, konsolebox, 2019/04/09
Re: "here strings" and tmpfiles, konsolebox, 2019/04/09